As well as medical books, I take the time to read Christian books. And when I came across this prayer in a book called Lead me Holy Spirit by Stormie Omartian I wanted it to encourage you too.
Being healthy, feeling good, means for our body and our mind, which are very closely connected, to be well tuned. To that effect this prayer has helped me and it can also help you should you choose to read it.
“Lord, I pray You will give me the ability to walk away from any destructive habits I have with regards to caring for my body. Keep me ever mindful that my body is your temple and I need to take care of it. Help me to follow Your leading in every decision I make each day, especially what I put into my body and how I exercise. Help me to value my body enough to look after it. I confess the times I have been critical of my body and not grateful to You for it. Forgive me for that. Keep me from ever judging or mistreating it in any way.
Lord, help me to always observe a day of rest each week. Enable me to do it to Your glory so that I am rejuvenated in my body, mind, and emotions. Help me to give my body and mind rest from all else but Your voice to my heart. You know what is best for me because You created me. So I ask You to reveal to me all I need to do and avoid doing. Give me the discipline and self-control I need to carry it out. I know that self-control is a fruit of the Spirit, so I pray I will have such a manifestation of self-control that it will be explained no other way than as a gift from You.
In Jesus’ name I pray.”
A couple of references you can also look up are 1 Corinthians 3:16-17 and Romans 12:1